Current versions of each, I would say Shulkie is stronger. Cassie's got the flight advantage, speed advantage, skill advantage, and equipment advantage.
Ares powered Cassie is weaker than current, but she was still able to catch a falling plane, stagger Hercules, trounce various Furies by herself, outmuscle Match, slam Supergirl hundreds of yards away, and smack Superboy away with a tree. Shulkie may be durable, but Cassie has the means to harm her.
Generally, She-Hulk is stronger and more durable; Wonder Girl is faster, can fly, and has a (marginal) skill advantage (while a good fighter, and trained, she *isn't* Donna, and certainly not Diana, and Jen is a decent fighter, and not just a brawler/rock'em-sock'em...).
I'd say it's a general split. Jen wins if she can keep it mano-y-mano/grappling, with little range/separation; Cassie wins if she has area/space to move the battle around.
And, of course, if Cass has her lasso, then she gets the solid stomp: between having her own anger/strength effectively turned against her, and WG laying down the whoop-ass, Jen would't stand much of chance.
__________________ Why am I here commenting on this crap?